M Part M:P Carb Fork Expander, a 1 inch headset top cap and expander for carbon composite steerer tubes, in stock in Kennington for collection or fitting.
An expander style headset top cap assembly for 1 inch carbon composite steerer tubes. Rather than a star nut hammered into place, it expands inside the steerer to give the top cap something to pull against when you set headset preload, and it does so without scoring or marking the inside of the tube. That is why M Part recommend it for carbon composite steerers, where a driven star nut is not the right tool for the job.
The finish is anodised black with a lacquered carbon fibre top cap, so it tidies up the front of the bike as well as doing the work. Pick it if you are building up or servicing a fork with a 1 inch carbon composite steerer, or replacing a worn expander. We have it on the shelf here in Kennington for free click and collect, and our mechanics can fit and set your headset the same day.
Free same-day Click & Collect. Order online and collect from our London workshop, usually ready within a couple of hours. We will email you the moment it is ready.
Home delivery. Dispatched the same working day on orders placed before 3pm. Standard UK delivery is £2.99, free on orders over £75, tracked, and typically arrives in 2 to 3 working days.
Fitting while you wait. Buying a part you would rather not fit yourself? Our mechanics can fit most parts on the spot. Just ask when you collect.
30-day returns. Changed your mind? Return any unused item in its original packaging within 30 days for a full refund.
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